Thomas h



(No Model.)

. 'I'. H. MGGRAY.

BELT GBARING.

110,465,141. Patented Deo. 15,1891.

UNITED STATES PATENT OFFICE.

THOMAS II. MCCRAY, OF CHICAGO, ILLINOIS, ASSIGNOR TO LESTER L. BOND,

OF SAME PLACE.

BELT-GEARING.

SPECIFICATION forming part of Letters Patent No. 465,141, dated December I5, 1891.

Application tiled January '7, 1891.

T 0 all 1070079@ it may concern:

Be it known that I, THOMAS H. MCCRAY, residing at Chicago, in the countyof Cook and State of Illinois, and a citizen of the United States, have invented a new and useful Improvement in Belt-Gearing, of which the following is a specification, reference being had -to the accompanying drawings, in which* Figure l is a side elevation. Fig. 2 is a central vertical section, and Fig. 3 is a plan or edge view.

The object of this invention is to provide a sprocket-wheel for chains made of detachable bars or flat links, which will give the chains a bearing on two or more points, so as to avoid excessive Wear upon either wheel or chain,or both, and also to give the Wheel and chain a stronger connection together to prevent slippin g or loss of motion. I attain these objects by the means shown in the drawings and hereinafter described.

What I deem to be new will be pointed out in the claims.

In the drawings, A indicates the sprocketwheel, B its shaft, and C the chain.

@,a, and a2 indicate what maybe described as three disks, but which in making are cast together as one, Ct and a being the exterior ones, and a2 the middle one; b, h', and b2, projections or teeth on the outer disks of the wheel; c d, notches or depressions on the in ner disks; e, teeth or projections on the under surface of the chain-links, and f connectingpins for the chain-links.

The wheel A, with its shaft B, is usually cast in one piece, as shown; but the wheel may be provided with a central hole and the shaft B made separately and inserted therein. If it is desired to make the wheel of steel or platewmetal, it may also be made in the three sections a ct a2 and the sections bolted or riveted together. For ordinary purposes, however, it will be sufficient to make these parts of cast-iron as one piece. The

outer sections et ct on the wheel A are provided with projections or teeth b b', placed opposite to each other, as shown in Fig. 3,

Serial No. 377,056. (No model.)4

and with notches or depressions c to receive the teeth e of the double bar-links of the chain, and the inner section a? is provided with depressions to receive the teeth or projections c of the single bar-links of the chain. The teeth or projections b b b2, as shown, are made in pairs; but this is only for the purpose of reducing the weight, and they may be .run together, as the spaces between the pairs perform no service in operation. As shown, the chain is moved slightly backward on the wheel, so that the bearing-points are out of contact; but in operation the ends of the double links bear against the projections b b', while the ends of thev single links bear against the projections b2, and the teeth e bear against the side of the notches c and d,

'so as to give the chain two points ofbearingf contact for each link when in use, and when in operation the single links pass between the projections ZJ Z9', while the projection b2 passes into the space between the double links, as shown in Fig. 3, so that these projections perform the additional service of acting as guides for the chain in keeping it in place upon the wheel, so as to dispense with guide-danges upon the sides, and I therefore am enabled to produce and useV a Wheel no greater in thickness than the width of the double links of the chain. By this arrangement I produce a sprocket-wheel adapted to the form of chains shown, which is simple in construction, maintains the position of the chain on the wheel, and gives it two bearingpoints, which reduces the Wear of the chain and relieves the strain upon the connectingpins of the chain or the chain-joints in turning the curve necessary to rotate the wheel or to be driven by the wheel.

The chain C is more fully described in yanother application of even date herewith.

That which I claim as new, and desirel to secure by Letters Patent, is

9 1. A sprocket-wheel A, composed of the sections a, a a2, having the projections b b b2 and the peripheral notches c and d arranged between the projections, as described,

to receive and co-operate With the projecting links having projecting teeth e on their unteeth e on the under surfaces of the chainder surfaces, which enter and co-operate with 1o links, substantially as specified. the notches or depressions c d, substantially 2. A sprocket-WheelA, having exterior proas described.

5 jections b b and notches or depressions c, and i v THOMAS H. MCCRAY.

an interior section having projections b2 and Vitnesses: notches or depressions d,in combination With JOHN L. JACKSON, the chain C, composed of double and singe NELLIE MOKIBBEN. 

